Ammonites are perhaps the most widely known fossil, possessing the typically ribbed spiral-form shell as pictured above. These creatures lived in the seas between 240 - 65 million years ago, when they became extinct along with the dinosaurs.
A shell that displays the Fibonacci spiral. Fibonacci's sequence and phi are important mathematical concepts (especially in biology) in the same way Planck's constant is important to Quantum Mechanics.
nautilus~The Story of the Chambered The rare and remarkable chambered nautilus has long captivated scientists, mathematicians, and poets. Reproducing itself in perfect symmetry and accuracy, the nautilus depends on each component to complement its self-contained system. Yet, it remains open-ended for perpetual evolution and change.